How do i know which size to purchase? how do they fit compared to small, medium, large earbuds for listening to music?

I'm not the best person to answer perhaps. I found them useless. No better than cheap chinese plugs I use for swimming. Why did I buy them? I've owned 4 pairs of etymotic headphones and consider them the best in the world. I've owned custom mould UE5s and Etys are better and their fit with the triple flange (for me) is perfect so ... I'm an Ety fan and expected these to be great. Perhaps I should have persisted and of course take other people's (positive) views into account...

What would happen if you used them for shooting

Never used them for shooting so I couldn’t say. I do know that there are plugs designed to protect the ears from the noise of guns. Best google it to find out.

Are these washable, and if so can they be lent to someone else after washing?

The rubber bell ones, yes, although I would pop them off the hard plastic base before gettnig them wet. As for lending them to someone else, I'm not sure I would personally recommend that without dousing them in milton fluid before using them again myself.

Can they be returned if they don't fit?

You would need to ask Amazon as I wouldn't think so. I would always recommend the more expensive version as it has all sizes and you are guaranteed a fit,

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Etymotic ER20XS-SMF-P High Fidelity Reusable Earplugs [Polybag], Ultra-Compact Comfortable Hearing Protection for Concerts, Festivals, Sports Events, Sleep, -20dB even volume reduction, Standard Size

Product ID: 67063888

Details

Brand
Etymotic
Colour
Standard
Material
Foam
Recommended uses for product
hearing in
Size
1 count (Pack

🎧20dB even sound reduction

🧢ultra-compact stemless design

♻️reusable & easy to clean

194.80 DT

Duties & taxes included

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Description

🎶 Protect your vibe, not your style.

BUILT TO LAST REUSE - Durable, easy-to-clean earplugs with a convenient neck cord and protective case.
VERSATILE NOISE DEFENSE - Ideal for concerts, festivals, sports, travel, and even restful sleep.
DISCREET ALL DAY COMFORT - Stemless, ultra-compact design fits seamlessly under hats, helmets, and headgear.
TAILORED FIT FOR EVERY EAR - Includes 3 interchangeable ear tips (silicone & foam) for a perfect, secure seal.
CRYSTAL CLEAR SOUND PROTECTION - Experience balanced -20dB noise reduction without muffling music or speech.

The Etymotic ER20XS-SMF-P earplugs deliver professional-grade hearing protection with a uniform 20dB noise reduction across all frequencies. Their innovative stemless, ultra-compact design ensures discreet comfort under any headgear, while three interchangeable ear tips guarantee a personalized fit. Reusable and easy to maintain, these earplugs come with a neck cord and carrying case, making them the ultimate accessory for music lovers, festival goers, and professionals seeking to safeguard their hearing without sacrificing sound clarity.

Specifications

ASIN	B00RM6Q9XW
ASIN	B00RM6Q9XW
Best Sellers Rank	646 in Musical Instruments & DJ ( See Top 100 in Musical Instruments & DJ ) 9 in Ear Protection
Brand Name	Etymotic Research
Colour	Standard
Country Of Origin	USA
Country of origin	USA
Customer Reviews	4.1 4.1 out of 5 stars (5,772)
Customer reviews	4.1 4.1 out of 5 stars (5,772)
Global Trade Identification Number	00084643001747, 00846430001749
Guaranteed software updates until	unknown
Is discontinued by manufacturer	No
Item Dimensions	10 x 19 x 10 millimetres
Item Form	Pair
Item Weight	0.4 Ounces
Item model number	ER20XS-SMF-P
Manufacturer	Etymotic Research, Inc.
Manufacturer	Etymotic Research, Inc.
Manufacturer Part Number	ER20XS-SMF-P
Material Type	Foam
Model Name	ER•20XS-SMF-P
Model Number	ER20XS-SMF-P
Net Content Count	1 Count
Noise Attenuation	20
Noise Reduction Rating	20 Decibels
Number of Items	1
Number of Pieces	2
Package Size Name	Pack of 1
Product Dimensions	1.02 x 1.91 x 1.02 cm; 11.34 g
Product Style	Standard
Recommended Uses For Product	hearing protection in noisy environments
Reusability	Reusable
Single Number Rating	20 Decibels
Size	1 count (Pack of 1)
Specific Uses For Product	Noise Protection
Sport Type	Shooting
UPC	846430001749 084643001747
Unit Count	1 count

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